Invention Grant
- Patent Title: SAW resonator with resonant cavities
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Application No.: US14939751Application Date: 2015-11-12
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Publication No.: US09853624B2Publication Date: 2017-12-26
- Inventor: Benjamin P. Abbott , Yiliu Wang
- Applicant: RF Micro Devices, Inc.
- Applicant Address: US NC Greensboro
- Assignee: Qorvo US, Inc.
- Current Assignee: Qorvo US, Inc.
- Current Assignee Address: US NC Greensboro
- Agency: Withrow & Terranova, P.L.L.C.
- Main IPC: H03H9/25
- IPC: H03H9/25 ; H03H9/64 ; H03H9/02 ; H03H9/145

Abstract:
A surface acoustic wave (SAW) resonator is provided with reduced rattling at frequencies lower than the resonance value. The SAW resonator includes an interdigital transducer (IDT) on a piezoelectric substrate. The IDT includes a first set of interdigital electrodes distributed between and parallel to the first end of the IDT and the second end of the IDT and a second set of interdigital electrodes interleaved with the first plurality of interdigital electrodes. A first resonant cavity is formed a predetermined distance from the first end of the IDT, and a second resonant cavity is formed a predetermined distance from the second end of the IDT. Additionally, a radio frequency (RF) filter is provided that includes multiple SAW resonators that include the resonant cavities formed a predetermined distance from the first and second ends of the IDT. This RF filter may provide increased bandwidth and reduced insertion loss.
Public/Granted literature
- US20160380614A1 SAW RESONATOR WITH RESONANT CAVITIES Public/Granted day:2016-12-29
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